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Clin Infect Dis. 2016 Oct 1;63(7):904-910. doi: 10.1093/cid/ciw462. Epub 2016 Jul 11.

Impact of Reported Beta-Lactam Allergy on Inpatient Outcomes: A Multicenter Prospective Cohort Study.

Author information

1
Division of Infectious Diseases, Department of Medicine.
2
Department of Medicine.
3
Drug Safety Clinic, Sunnybrook Health Sciences Centre, Canada.
4
Centre for Quality Improvement and Patient Safety, University of Toronto.

Abstract

BACKGROUND:

Reported allergy to beta-lactam antibiotics is common and often leads to unnecessary avoidance in patients who could tolerate these antibiotics. We prospectively evaluated the impact of these reported allergies on clinical outcomes.

METHODS:

We conducted a trainee-led prospective cohort study to determine the burden and clinical impact of reported beta-lactam allergy on patients seen by infectious diseases consultation services at 3 academic hospitals. The primary outcome was a composite measure of readmission for the same infection, acute kidney injury, Clostridium difficile infection, or drug-related adverse reactions requiring discontinuation. Predictors of interest were history of beta-lactam allergy and receipt of preferred beta-lactam therapy.

RESULTS:

Among 507 patients, 95 (19%) reported beta-lactam allergy; preferred therapy was a beta-lactam in 72 (76%). When beta-lactam therapy was preferred, 25 (35%) did not receive preferred therapy due to their report of allergy even though 13 (52%) reported non-severe prior reactions. After adjustment for confounders, patients who did not receive preferred beta-lactam therapy were at greater risk of adverse events (adjusted odds ratio [aOR], 3.1; 95% confidence interval [CI], 1.28-7.89) compared with those without reported allergy. In contrast, patients who received preferred beta-lactam therapy had a similar risk of adverse events compared with patients not reporting allergy (aOR, 1.33; 95% CI, .62-2.87).

CONCLUSIONS:

Avoidance of preferred beta-lactam therapy in patients who report allergy is associated with an increased risk of adverse events. Development of inpatient programs aimed at accurately identifying beta-lactam allergies to safely promote beta-lactam administration among these patients is warranted.

KEYWORDS:

antimicrobial stewardship; beta-lactam allergy; clinical outcome; penicillin allergy; quality improvement

PMID:
27402820
DOI:
10.1093/cid/ciw462
[Indexed for MEDLINE]

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